| 冰盖下水流垂线流速分布规律研究 |
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| 引用本文： | 茅泽育,罗昇,赵升伟,相鹏,岳光溪.冰盖下水流垂线流速分布规律研究[J].水科学进展,2006,17(2):209-215. |
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| 作者姓名： | 茅泽育 罗昇 赵升伟 相鹏 岳光溪 |
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| 作者单位： | 1.清华大学水利水电工程系, 北京, 100084; |
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| 基金项目： | 中国科学院资助项目;清华大学校科研和教改项目 |
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| 摘 要： | 河道中冰盖显著改变了水流流动结构.采用k-ε紊流模型建立了冰盖下水流流动垂向二维数值模型;根据量纲分析理论提出了流速分布规律的影响因素;针对各种因素的不同组合进行了数值计算,并对其流动特性如最大流速点位置、冰区及床面区平均流速等进行了分析研究;对冬季封冻河道的二点测流法精度进行了理论分析.研究结果表明,冰盖下水流的纵向流速在流动核心区并不遵循对数分布规律,同时揭示了冰盖底部与河床的相对粗糙比、河床相对粗糙度及雷诺数对流速分布规律的影响.
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| 关 键 词： | 封冻河道 流速分布规律 紊流模型 数值计算 流动特性 |
| 文章编号： | 1001-6791（2006）02-0209-07 |
| 收稿时间： | 2004-11-20 |
| 修稿时间： | 2005-01-10 |
Study on the velocity distributions for ice-covered flow |
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| MAO Ze-yu,LUO Sheng,ZHAO Sheng-wei,XIANG Peng,YUE Guang-Xi.Study on the velocity distributions for ice-covered flow[J].Advances in Water Science,2006,17(2):209-215. |
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| Authors: | MAO Ze-yu LUO Sheng ZHAO Sheng-wei XIANG Peng YUE Guang-Xi |
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| Affiliation: | 1.Dept. of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;2.Dept. of Thermal Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | The presence of an ice-cover in a river will signif icantly change flow structure.The vertical two dimensional numerical model for ice-covered flow is developed by the k-ε turbulence model.Based upon the theory of dimensional analysis the factors influencing the velocity distribution patterns are proposed.The numerical experiments for various combinations of factors are conducted,and the flow characteristics such as location of the maximum velocity,mean velocities of obth ice-affected region and bed-diffected region are analyzed.The accuracy of two-point depth averaged flow measurement for ice-covered river is investigated The results reveal that the sectional velocity distribution deviates from the logarithmic law in the core flow area Meanwhile,the influence of roughness ratio of ice-cover bottom to bed,bed relative roughness and Reynold number on velocity distribution pattern is indicated. |
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| Keywords: | freeze-up river velocity distribution turbulence model numerical simulation flow structure |
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